October in Idaho Falls averages a daily high of 16°C with nights around 1.4°C. Expect roughly 6.8 wet days totalling 29.4mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Idaho Falls is June.
Based on IDAHO FALLS KIFI, ID US (5.5km), 1995–2024. 26 years of October data.